27-07-2012, 12:38 PM
this is rajitha doing btech final year.I did laptop audio amplifier as my mini project..i need pptLaptop audio amplifier:
ABSTRACT:
Usually, the audio output from a laptop’s built-in speakers is low. A power amplifier is required to get a high volume.This simple circuit can amplify the laptop’s audio output.
The circuit is built around power amplifier IC LA 4440 (IC1) and a few other components. LA4440 is a dual channel audio power amplifier. It has low distortion over a wide range of low to high frequencies with good channel separation. Inbuilt dual channels enable it for stereo and bridge amplifier applications.
In dual mode LA4440 gives 6 watts per channel and in bridge mode 19- watt output. It has ripple rejection of 26 dB. The audio effect can be realised by using two 6-watt speakers. pins 2, 6 and ground of IC1 are to be connected to the stereo jack which is to be used with the laptop.
The circuit works off regulated 12V power supply
s for that project.